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Search Results: 1 - 10 of 30158 matches for " Arturo González-Robles "
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EhADH112 Is a Bro1 Domain-Containing Protein Involved in the Entamoeba histolytica Multivesicular Bodies Pathway
Cecilia Ba uelos,Guillermina García-Rivera,Israel López-Reyes,Leobardo Mendoza,Arturo González-Robles,Silvia Herranz,Olivier Vincent,Esther Orozco
Journal of Biomedicine and Biotechnology , 2012, DOI: 10.1155/2012/657942
Abstract: EhADH112 is an Entamoeba histolytica Bro1 domain-containing protein, structurally related to mammalian ALIX and yeast BRO1, both involved in the Endosomal Sorting Complexes Required for Transport (ESCRT)-mediated multivesicular bodies (MVB) biogenesis. Here, we investigated an alternative role for EhADH112 in the MVB protein trafficking pathway by overexpressing 166 amino acids of its N-terminal Bro1 domain in trophozoites. Trophozoites displayed diminished phagocytosis rates and accumulated exogenous Bro1 at cytoplasmic vesicles which aggregated into aberrant complexes at late stages of phagocytosis, probably preventing EhADH112 function. Additionally, the existence of a putative E. histolytica ESCRT-III subunit (EhVps32) presumably interacting with EhADH112, led us to perform pull-down experiments with GST-EhVps32 and [35S]-labeled EhADH112 or EhADH112 derivatives, confirming EhVps32 binding to EhADH112 through its Bro1 domain. Our overall results define EhADH112 as a novel member of ESCRT-accessory proteins transiently present at cellular surface and endosomal compartments, probably contributing to MVB formation during phagocytosis.
Determinantes psicolingüísticos da compreens?o de leitura em inglês como língua estrangeira
Vivaldo-Lima, Javier;López-Olivas, Miguel;González-Robles, Rosa Obdulia;
Psicologia Escolar e Educacional , 2003, DOI: 10.1590/S1413-85572003000100003
Abstract: the purpose of this study was to analyze the contribution of linguistic and psychological variables in the explanation of the variance associated with reading comprehension in english (l2). two hundred and eighty mexican university students participated in the study. the variables analyzed within the linguistic dimension were: reading strategies in spanish, linguistic competence in english, and ability to perceive lexical transparency between l1 and l2. the psychological dimension evaluated the influence of the reader’s cognitive style, locus of control, and action control orientation on reading comprehension in l2. subjects were administered a battery of seven evaluation instruments. multiple regression analyses suggested a two-stage explanatory model of reading in l2. firstly, psychological variables accounted for 10.0% of the variance in reading comprehension in the first language. secondly, reading comprehension in spanish, linguistic competence in l2, and perception of lexical transparency, accounted for 35.5% of the variance in reading comprehension in english.
Sleep Deprivation Affects Working Memory in Low but Not in High Complexity for the N-Back Test  [PDF]
Guadalupe J. Terán-Pérez, Alejandra E. Ruiz-Contreras, Rosa O. González-Robles, Rosario Tarrago-Castellanos, Roberto E. Mercadillo, Anabel Jiménez-Anguiano, Javier Velázquez-Moctezuma
Neuroscience & Medicine (NM) , 2012, DOI: 10.4236/nm.2012.34047
Abstract: Sleep clearly influences learning and memory since sleep deprivation and stress impairs both cognitive processes. Working memory is an essential cognitive process and refers to a short-term holding of incoming information required to update the long-term mnemonic storage and to manipulate new elements in order to solve problems and make decisions. Nevertheless, the influence of sleep deprivation on working memory has scarcely been studied. In this study we evaluated working memory using the N-back test after increasing periods of wakefulness. Healthy young males were kept awake for 36 hours and the two N-back tasks with low (1-Back) and high (3-Back) levels of complexity were applied every 6 hours. Additionally, salivary cortisol was determined along the study. Unlike the control non-deprived participants, the sleep deprived volunteers showed a significant decrease in their efficiency to solve the 1-Back task after 24 hours of sleep deprivation. However, no differences were observed after 30 and 36 hours of sleep deprivation. Concerning the 3-Back task no differences were observed after sleep deprivation. Regarding reaction time, the deprived group manifested slower responses for the 1-Back task and for the 3-Back task after 30 hours and 36 hours of sleep deprivation, respectively. Cortisol levels presented the normal daily oscillation and no differences were observed between groups. This data suggests that sleep deprivation affects basal states of attention instead of working memory while performing simple tasks. The impact of sleep deprivation on the cognitive performance depends on the moment of day when the task is applied and the complexity of the tests used to assess these mnemonic skills.
Frecuencia de infección por VIH/sida en usuarios de preservativo Frequency of infection by HIV/ AIDS preservative users
Bertha Alicia Olmedo-Buenrostro,Hugo Alberto González-Robles,Ivan Delgado-Enciso,Ana Bertha Mora-Brambila
Revista Cubana de Investigaciones Biom??dicas , 2012,
Abstract: El propósito fundamental del presente trabajo fue identificar la frecuencia de pacientes atendidos en el servicio de Medicina Interna del Hospital General de Zona No. 1 IMSS-Colima que habiendo utilizado el preservativo en todas sus coitos estuvieran infectados con VIH/sida descartando otra vía de transmisión; considerando su edad, sexo, estado civil, lugar de residencia, número de parejas sexuales y preferencia sexual. El objetivo de este trabajo fue identificar la frecuencia de pacientes infectados por VIH/sida en usuarios de preservativo. Es un estudio descriptivo transversal. Se estudió una muestra de 61 pacientes VIH/sida, durante los meses agosto-octubre, que acudieron a sus citas de control al servicio de medicina interna del Instituto Mexicano del Seguro Social de la ciudad de Colima a quienes se les invitó a participar garantizándoles el anonimato, se obtuvieron medidas de tendencia central. De los 61 pacientes con VIH/sida descartando otra vía de transmisión, 12 (20 %) refirieron haber utilizado en todas sus coitos el preservativo, de los cuales 3 (25 %) eran mujeres y 9 (75 %) hombres. El rango de 20 a 39 a os de edad y los solteros fueron los más afectados. Número de parejas sexuales: 8 (67 %) varias parejas y 4 (33 %) una pareja. Preferencia sexual: 3 (25 %) heterosexuales, 7 (58 %) homosexuales y 2 (17 %) bisexuales. Se concluye que el preservativo no es del todo efectivo, para la protección de enfermedades de transmisión sexual como el VIH/SIDA. The primary purpose of this study was to identify the frequency of patients treated at the Internal Medicine Service of General Hospital Zone No. 1 IMSS, Colima having used preservative in all sexual intercourse were infected with HIV / AIDS discarding other means of transmission, considering his age, sex, marital status, place of residence, number of sexual partners and sexual preference. The aim of this study was to identify the frequency of patients infected with HIV / AIDS in preservative users. It is a cross-sectional study. The sample consisted of 61 patients with HIV / AIDS during the months from August to October, which came to control appointments to the service of internal medicine of the Instituto Mexicano del Seguro Social in Colima city who were invited to participate by guaranteeing anonymity, we obtained measures of central tendency. Of the 61 patients with HIV / AIDS discarding other means of transmission, 12 (20%) reported having used preservatives all their intercourse, of whom 3 (25%) were female and 9 (75%) men. The range of 20 to 39 years old and single were the most affected.
Transcraneal Magnetic Stimulation Improves Sleep Parameters in Patients Affected with Imsomnia Associated to Electroencephalographic Abnormalities  [PDF]
Oscar Sánchez-Escandón, Yoaly Arana-Lechuga, Guadalupe Terán-Pérez, Enrique Esqueda-Leon, Rosa Obdulia González-Robles, ángel Ruiz-Chow, Paul Shkurovich-Bialik, Miguel ángel Collado-Corona, Javier Velázquez-Moctezuma
Neuroscience & Medicine (NM) , 2014, DOI: 10.4236/nm.2014.51010
Abstract:

Insomnia is one of the most frequently observed sleep disorders, affecting nearly 10% of the general population. It has multiple etiological factors. Recently, it has been reported that EEG abnormalities are associated with insomnia in patients previously diagnosed as idiopathic insomniacs. In addition, transcranial magnetic stimulation (TMS) has shown to be effective in the treatment of disorders characterized by neural hyper-excitability. Method: In the present study, patients with insomnia and EEG abnormalities were submitted to slow repetitive trans-cranial magnetic stimulation, for 15 minutes daily during 10 days. Polysomnographic recordings were performed before and after TMS. Results: The results indicate that the presence of EEG abnormalities significantly decreased after TMS. In addition, most of the sleep parameters showed significant improvement. Conclusions: These data support the notion that TMS is a reliable therapeutic tool for patients affected with abnormalities linked to neuronal hyper-excitability.

Selección de cepas de Bacillus spp. productoras de antiobióticos aisladas de frutos tropicales
Ragazzo-Sánchez, Juan Arturo;Robles-Cabrera, Alejandra;Lomelí-González, Leopoldo;Luna-Solano, Guadalupe;Calderón-Santoyo, Montserrat;
Revista Chapingo. Serie horticultura , 2011,
Abstract: the aim of this work was to isolate and select bacillus strains according to their ability to produce antibiotic substances useful in the control of postharvest diseases of tropical fruits. fifty strains were isolated from the surface of tropical fruits and from soil samples. eight strains showed better in vitro inhibition rates versus postharvest fungi of tropical fruits. lipopeptidic antibiotics were extracted with 1-butanol and analyzed by high-pressure liquid chromatography (hplc) with a c18 column varian?. the mobile phase was acetonitrile (0-80 % v/v). the isolated strains produced antibiotics from the family iturin a and surfactin. the strain pla10 produced the highest concentrations of iturin a and surfactin. iturin a fractions had fungicidal activity, but the surfactin fractions did not show any activity. however, when both fractions were applied together, a synergistic effect was obtained during the inhibition of colletotrichum sp. from mango. the strain pla10 was identified as bacillus subtilis.
De qué se mueren los ancianos en Espa a?
Robles González, Elena
Estudios Geográficos , 2009,
Abstract: Following the analyses of the standardized mortality rates, that allows to eliminate the effect of age structure, the impact of mortality is directly appreciated and the evolution of the main causes of death in the 80+ population in Spain between 1975 and 2007, is described. Using the Short-List of Eurostat, causes of death have been divided into 17 broad groups. The article analyzes the decline of mortality caused by the fall of circulatory diseases, mainly the cerebrovascular ones, and to a lesser extent, the respiratory diseases, ill-defined diseases and external causes. Inversely, in the remaining thirteen groups the mortality has increased over such period particularly, the neoplasms, nervous system diseases and mental disorders. Important differences by gender have been found, being neoplasms and respiratory diseases much higher in men, which would explain the greater men oldest-old mortality in Spain. Se analiza la evolución, entre 1975 y 2007, de las principales causas de muerte en la población espa ola de 80+ a os, a partir del análisis de las tasas estandarizadas de mortalidad que, al eliminar el efecto de la estructura por edad, permiten apreciar el impacto de la mortalidad. Las causas de muerte se han agrupado en 17 grandes grupos, siguiendo la Lista Abreviada de Eurostat. Se describe la caída de la mortalidad debida al descenso de las enfermedades circulatorias, (en especial las cerebrovasculares) y, en menor medida, de las respiratorias, las mal definidas y las causas externas. Por el contrario, la mortalidad en los 13 grupos restantes se ha incrementado durante el período, sobre todo la relativa a tumores, enfermedades del sistema nervioso y trastornos mentales. Se constatan importantes diferencias por género, siendo los tumores y las enfermedades respiratorias muy superiores en los hombres. Ello explicaría la mayor mortalidad masculina de la población anciana. [fr] On analise l’évolution des principales causes de mort chez la population espagnole de plus de 80 ans de 1975 à 2007, sur la base de l’analyse des taux standarisés de mortalité qui permettent aprécier l’impact de la mortalité en éliminant l’effet de la structure par age. Les causes de mort ont été groupées en 17 grands groupes suivant la liste abrégée d’Eurostat. On découvre la chute de la mortalité, due à la déscente des maladies circulatoires, en particulier les cardiovasculaires et, à une moindre échelle, des respiratoires, les mal définies et les causes externes. La mortalité chez le reste des groupes est augmenté au long de cette periode, surtout les tumeurs et les maladie
Los tratados de libre comercio impulsados por Estados Unidos en América Latina y la profundización del subdesarrollo
Huerta González, Arturo;
Contaduría y administración , 2007,
Abstract: este trabajo analiza la política comercial seguida por estados unidos (eua) hacia américa latina y el caribe ante el estancamiento generado en las negociaciones del acuerdo de libre comercio para las américas (alca), así como la aceptación de la mayoría de los países del área a las directrices fijadas por los eua. asimismo, se estudia la posición asumida sobre todo por brasil y argentina en contra del alca, además de la situación actual del tratado de libre comercio de américa del norte (tlcan) y la pérdida de competitividad que enfrenta méxico con china en el mercado estadounidense. a pesar de que la teoría predominante prioriza el libre comercio y el crecimiento hacia fuera como estrategia de crecimiento para los países del área, este trabajo se encamina a demostrar que dicha estrategia no representa la alternativa de crecimiento que estos países requieren debido a que no cuentan con las condiciones productivas y financieras para salir exitosos en dicho proceso.
Los tratados de libre comercio impulsados por Estados Unidos en América Latina y la profundización del subdesarrollo
Arturo Huerta González
Contaduría y administración , 2007,
Abstract: Este trabajo analiza la política comercial seguida por Estados Unidos (EUA) hacia América Latina y el Caribe ante el estancamiento generado en las negociaciones del Acuerdo de Libre Comercio para las Américas (ALCA), así como la aceptación de la mayoría de los países del área a las directrices fijadas por los EUA. Asimismo, se estudia la posición asumida sobre todo por Brasil y Argentina en contra del ALCA, además de la situación actual del Tratado de Libre Comercio de América del Norte (TLCAN) y la pérdida de competitividad que enfrenta México con China en el mercado estadounidense. A pesar de que la teoría predominante prioriza el libre comercio y el crecimiento hacia fuera como estrategia de crecimiento para los países del área, este trabajo se encamina a demostrar que dicha estrategia no representa la alternativa de crecimiento que estos países requieren debido a que no cuentan con las condiciones productivas y financieras para salir exitosos en dicho proceso
La política macroeconómicade la globalización
Arturo Huerta González
Contaduría y administración , 2001,
Abstract:
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